php缓存之yac
php缓存 一般使用redis,mamache,mongo,file等。
介绍下今天主角-[YAC](http://www.laruence.com/2013/03/18/2846.html)无锁共享内存cache。
具体介绍可查看 鸟哥博客[http://www.laruence.com/2013/03/18/2846.html](http://www.laruence.com/2013/03/18/2846.html)
[yac文档https://github.com/laruence/yac ](https://github.com/laruence/yac)
下面贴上代码：
```
class yacCache{
private $yac;
function __construct(){
$conf=C('YAC_CACHE');
if(!class_exists('Yac')){
E('还未安装yac拓展。');
}
$this->yac=new Yac($conf['fix']);
}
function get($name){
// 获取缓存数据
if (isset ( $_SERVER [$name] )) {
if ($_SERVER [$name] ['time'] > time ()) {
$cachedata = $_SERVER [$name] ['data'];
if(C('CACHE_ZIP')){
$cachedata =gzuncompress(base64_decode($_SERVER [$name] ['data']));
}
return unserialize($cachedata);
} else {
unset ( $_SERVER [$name] );
$this->yac->delete($name);
return false;
}
}
$value = $this->yac->get($name);
if ($value) {
$value = unserialize ($value);
if ($value ['time'] > time ()) {
$_SERVER [$name] = $value;
$cachedata = $value['data'];
if(C('CACHE_ZIP')){
$cachedata =gzuncompress(base64_decode($value['data']));
}
unset($value);
return unserialize($cachedata);
#return $value ['data'];
} else {
unset ( $_SERVER [$name] );
$this->yac->delete($name);
return false;
}
} else {
$value = false;
}
return $value;
}
function set($name,$value,$effective = 1800){
if (is_null ( $value )) {
// 删除缓存
unset ( $_SERVER[$name] );
return $this->yac->delete($name);
} else {
$value = serialize($value);
$data ['data'] =serialize($value);
if(C('CACHE_ZIP')){
$temp = gzcompress($value, 9);
$data ['data'] = base64_encode($temp);
}
//$data ['data'] = ? base64_encode(gzcompress($value, 9)) : $value ;
$data ['time'] = time () + $effective;
$this->yac->set($name,serialize ($data));
$this->yac->delete($name,$effective);
// 缓存数据
$_SERVER [$name] = $data;
return null;
}
}
function clear(){
return $this->yac->flush();
}
}
```
\*存的值经过了压缩
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